<!DOCTYPE html>
<style>
::-webkit-scrollbar {
    height: 1px;
    width: 1px
}
::-webkit-scrollbar-thumb {
    background: rgba(255,0,0,0.8);
}
html {
    overflow-y: scroll
}
</style>
<script>
if (window.testRunner) {
  testRunner.dumpAsText();
  testRunner.setPageZoomFactor(5);
}
</script>
<div>
    Custom-Scrollbar needs layout when scrollbar thickness changed.
    <span>The test passed if chrome did not crash.</span>
</div>
<div style="width:600px"></div>
